JoeQ Posted July 2 Share Posted July 2 (edited) With the hot weather I'm looking to reduce temperatures though water changes. My question is: what degree of a change will be safe for my fish? Example my tank is 80 degrees, with a 50% water change can I refill with 70 degree water, or will that 10 degree difference be too much of a change in too short amount of time? Edited July 2 by JoeQ Link to comment Share on other sites More sharing options...
Pepere Posted July 2 Share Posted July 2 I would guess a 50% water change with a temp difference of 10 degrees would lower tank temp 5 degrees. given that the recommendation is to temp acclimate our fish by floating a bag for 15 minutes, doing a water change over 15 minutes would accomplish the same thing… I dont think a decrease of 5 degrees would be problematic. 1 Link to comment Share on other sites More sharing options...
JoeQ Posted July 2 Author Share Posted July 2 On 7/2/2023 at 12:44 PM, Pepere said: I dont think a decrease of 5 degrees would be problematic. At what point would the differential be too great? Link to comment Share on other sites More sharing options...
Pepere Posted July 2 Share Posted July 2 Realistically? How much do you want to lower the temp? And, how cold is your tap water? By Mid July my tap water running full cold is mid 70… what fish do you keep? What temp do you normally keep them at? Link to comment Share on other sites More sharing options...
Beardedbillygoat1975 Posted July 2 Share Posted July 2 I think when you get above 10 degrees you’re opening yourself up to more issues. Shock and stress related illness is what I’m worried about. If you need more than the 5 degrees running a fan over the surface can get you another 3 degrees. Another way I know some people will do this is add a water bottle that’s frozen but I’d save this for gasping fish or temps in the 90+ when you’re trying to get your tank closer to 80. Link to comment Share on other sites More sharing options...
Pepere Posted July 2 Share Posted July 2 If you normally keep fish at 70, I would probably do the 5 degrees and leave them there for 3-4 hours before dropping it another 5. Link to comment Share on other sites More sharing options...
JoeQ Posted July 2 Author Share Posted July 2 On 7/2/2023 at 12:59 PM, Beardedbillygoat1975 said: I think when you get above 10 degrees you’re opening yourself up to more issues. Thanks, that what I was thinking, 10 degrees being the biggest acceptable difference. Im a worry wort tho so I only did 3 degrees difference . It still got me nervous tho!!!! 😂 On 7/2/2023 at 12:58 PM, Pepere said: Realistically? How much do you want to lower the temp? No set goal, just randomly wondering. Link to comment Share on other sites More sharing options...
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